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<?php

/**
 * This file is part of CodeIgniter 4 framework.
 *
 * (c) CodeIgniter Foundation <admin@codeigniter.com>
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace CodeIgniter\HTTP;

use CodeIgniter\HTTP\Exceptions\HTTPException;

/**
 * Expected behavior of an HTTP request
 */
interface MessageInterface
{
    /**
     * Sets the body of the current message.
     *
     * @param mixed $data
     *
     * @return $this
     */
    public function setBody($data);

    /**
     * Appends data to the body of the current message.
     *
     * @param mixed $data
     *
     * @return $this
     */
    public function appendBody($data);

    /**
     * Populates the $headers array with any headers the getServer knows about.
     */
    public function populateHeaders(): void;

    /**
     * Returns an array containing all Headers.
     *
     * @return array<string, Header> An array of the Header objects
     */
    public function headers(): array;

    /**
     * Returns a single Header object. If multiple headers with the same
     * name exist, then will return an array of header objects.
     *
     * @param string $name
     *
     * @return array|Header|null
     */
    public function header($name);

    /**
     * Sets a header and it's value.
     *
     * @param array|string|null $value
     *
     * @return $this
     */
    public function setHeader(string $name, $value);

    /**
     * Removes a header from the list of headers we track.
     *
     * @return $this
     */
    public function removeHeader(string $name);

    /**
     * Adds an additional header value to any headers that accept
     * multiple values (i.e. are an array or implement ArrayAccess)
     *
     * @return $this
     */
    public function appendHeader(string $name, ?string $value);

    /**
     * Adds an additional header value to any headers that accept
     * multiple values (i.e. are an array or implement ArrayAccess)
     *
     * @return $this
     */
    public function prependHeader(string $name, string $value);

    /**
     * Sets the HTTP protocol version.
     *
     * @throws HTTPException For invalid protocols
     *
     * @return $this
     */
    public function setProtocolVersion(string $version);
}